They say knowing is half the battle. It only makes sense that being prepared is the other half. When you get to the gym or exercise class, you want to have everything you need so that you can get the most out of your workout. {relatedarticles}That's why it's important to pack your gym bag the night before. Here are some essentials you should never leave behind. For starters, an exercise towel will come in handy when you're dripping in sweat - not just for cleaning up yourself but your equipment as well. It's good gym etiquette to wipe down the machines after you've used them. You'll also need the towel when you're working out on exercise mats. Place it underneath your head or your hands whatever your preference may be. The next thing that is essential to your workout is water.